prodromous adjective 3noun 1 adjective3 •precursory.Prodromous Clouds whose edges are fringed with Gold, comfort us with the hopes of an approaching greater Light, which when the Sun is up, do but darken the Horizon. — 1678 •Pertaining to signs or symptoms that precede the onset of a disease.Where the second eye was quite free from prodromous symptoms, Graefe has seen it frequently affected shortly after operation on the first, somewhere about 10 per cent. — 1865 •Prophylactic.Whichever view is taken, it is equally antagonistic to the rule of prodromous catheterism in forceps-delivery. — 1881 noun1 •A sign of something to come; a harbinger.The prodromous had rung for Oliver and was giving him a most pleasant message, as well as a promise. — 2013